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to Technical
Information Main Page |
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| Table A) All
removal criteria are based on the use of steel sheave. |
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Equipment |
Running
Ropes*
# of allowable
broken wires in |
Rot.
Resistant*
# of allowable
broken wires in |
Standing
Ropes*
# of allowable
broken wires
|
| Standard |
Vers. |
1
rope
lay |
1
strand in 1 lay |
1 rope
lay |
1 strand
in 1 lay |
in
1 lay behind end connection |
at
end connection |
|
| AMSE/B30.2 |
2001 |
Overhead and
Gantry Cranes |
12 |
4 |
- |
- |
- |
- |
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| AMSE/B30.3 |
1995 |
Hammerhead
Tower Cranes |
12 |
4 |
4 |
2 |
- |
- |
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| AMSE/B30.5 |
1995 |
Mobile and
Locomotive Cranes |
6 |
3 |
2 |
4
(in 30xd) |
- |
- |
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| AMSE/B30.6 |
1995 |
Derricks |
6 |
3 |
- |
- |
3 |
2 |
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| AMSE/B30.7 |
2001 |
Base Mounted
Hoists |
6 |
3 |
- |
- |
3 |
2 |
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| AMSE/B30.8 |
1995 |
Floating Cranes
and Derricks |
6 |
3 |
- |
4 |
3 |
2 |
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| AMSE/B30.16 |
1997 |
Overhead Hoists
(Underhung) |
12 |
4 |
- |
- |
2 |
- |
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*Also remove if you detect 1 wire broken at the contact point with the core
or adjacent strand; so called valley breaks. |
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Table B) Standard:
ISO 4309
Number of broken wires in round strand ropes working in steel sheaves |
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Number
of
load bearing
wires in
outer
strands |
Examples
of rope
constructions
and types |
Number
of visible broken wires* related to the fatigue of the rope
in a crane that gives rise to rejection
|
Class.
group M1, M2, M3, M4
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Ordinary
over a length of |
Langs
over a length of |
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Class.
group M5, M6, M7, M8
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Ordinary
over a length of |
Langs
over a length of |
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| 6d |
30d |
6d |
30d |
6d |
30d |
6d |
30d |
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| under 50 |
6x7, 7x7 |
2 |
4 |
1 |
2 |
4 |
8 |
2 |
4 |
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| 51 to 75 |
6x19 Seale* |
3 |
6 |
2 |
3 |
6 |
12 |
3 |
6 |
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| 76 to 100 |
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4 |
8 |
2 |
4 |
8 |
16 |
4 |
8 |
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| 101 to 120 |
6x26, 6x25,
8x19 Seale |
5 |
10 |
2 |
5 |
10 |
19 |
5 |
10 |
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| 121 to 140 |
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6 |
11 |
3 |
6 |
11 |
22 |
6 |
11 |
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| 141 to 160 |
8x19 Filler,
Python® Super 8 |
6 |
13 |
3 |
6 |
13 |
26 |
6 |
13 |
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| 161 to 180 |
6x36*,
Python® HS-9 |
7 |
14 |
4 |
7 |
14 |
29 |
7 |
14 |
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| 181 to 200 |
Python® Multi,
Python® Ultra |
8 |
16 |
4 |
8 |
16 |
32 |
8 |
16 |
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| 201 to 220 |
6x41* |
9 |
18 |
4 |
9 |
18 |
38 |
9 |
18 |
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| 221 to 240 |
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10 |
19 |
5 |
10 |
19 |
38 |
10 |
19 |
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| 241 to 260 |
8x36* |
10 |
21 |
5 |
10 |
21 |
42 |
10 |
21 |
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| 261 to 280 |
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11 |
22 |
6 |
11 |
22 |
45 |
11 |
22 |
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| 281 to 300 |
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12 |
24 |
6 |
12 |
24 |
48 |
12 |
24 |
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| 300 and over |
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0.04n |
0.08n |
0.02n |
0.04n |
0.08n |
0.16n |
0.04n |
0.08n |
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1) Filler wires are not regarded as load bearing wires and are therefore
excluded from the examination. In ropes having a number of strands, only
the visible outer layer is considered. In ropes having a steel core, this
is regarded as an internal strand and is not considered.
2) In the case of a calculation for number of visible broken wires, the
value is rounded to a whole number. For ropes having outer wires in the
external strands of LARGER size than the norm, the particular construction
is down-graded in the table indicated by an (*)
3) A broken wire may have two visible ends.
d=nominal diameter of the rope |
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| Table C) Standard:
ISO 4309 |
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Number
of visible broken wires in rotation resistant ropes working in steel
sheaves
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Classification
Groups for M1, M2, M3, M4
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Classification Groups
for M5, M6, M7, M8
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| Over a length
of 6d |
Over a length
of 30d |
Over a length of 6d |
Over a length of 30d |
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| 2 |
4 |
4 |
8 |
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Note: A broken wire may have two visible ends
d=nominal diameter of the rope |
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